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201 lines
8.5 KiB
C++
201 lines
8.5 KiB
C++
// Created on: 1993-11-09
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// Created by: Modelistation
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// Copyright (c) 1993-1999 Matra Datavision
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// Copyright (c) 1999-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef _Convert_CompBezierCurves2dToBSplineCurve2d_HeaderFile
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#define _Convert_CompBezierCurves2dToBSplineCurve2d_HeaderFile
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#include <Standard.hxx>
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#include <Standard_DefineAlloc.hxx>
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#include <Convert_SequenceOfArray1OfPoles2d.hxx>
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#include <TColgp_SequenceOfPnt2d.hxx>
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#include <TColStd_SequenceOfReal.hxx>
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#include <TColStd_SequenceOfInteger.hxx>
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#include <TColgp_Array1OfPnt2d.hxx>
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#include <TColStd_Array1OfReal.hxx>
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#include <TColStd_Array1OfInteger.hxx>
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//! Converts a list of connecting Bezier Curves 2d to a
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//! BSplineCurve 2d.
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//! if possible, the continuity of the BSpline will be
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//! increased to more than C0.
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class Convert_CompBezierCurves2dToBSplineCurve2d
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{
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public:
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DEFINE_STANDARD_ALLOC
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//! Constructs a framework for converting a sequence of
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//! adjacent non-rational Bezier curves into a BSpline curve.
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//! Knots will be created on the computed BSpline curve at
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//! each junction point of two consecutive Bezier curves. The
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//! degree of continuity of the BSpline curve will be increased at
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//! the junction point of two consecutive Bezier curves if their
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//! tangent vectors at this point are parallel. AngularTolerance
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//! (given in radians, and defaulted to 1.0 e-4) will be used
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//! to check the parallelism of the two tangent vectors.
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//! Use the following functions:
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//! - AddCurve to define in sequence the adjacent Bezier
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//! curves to be converted,
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//! - Perform to compute the data needed to build the BSpline curve,
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//! - and the available consultation functions to access the
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//! computed data. This data may be used to construct the BSpline curve.
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Standard_EXPORT Convert_CompBezierCurves2dToBSplineCurve2d(const Standard_Real AngularTolerance = 1.0e-4);
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//! Adds the Bezier curve defined by the table of poles Poles, to
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//! the sequence (still contained in this framework) of adjacent
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//! Bezier curves to be converted into a BSpline curve.
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//! Only polynomial (i.e. non-rational) Bezier curves are
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//! converted using this framework.
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//! If this is not the first call to the function (i.e. if this framework
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//! still contains data in its sequence of Bezier curves), the
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//! degree of continuity of the BSpline curve will be increased at
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//! the time of computation at the first point of the added Bezier
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//! curve (i.e. the first point of the Poles table). This will be the
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//! case if the tangent vector of the curve at this point is
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//! parallel to the tangent vector at the end point of the
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//! preceding Bezier curve in the sequence of Bezier curves still
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//! contained in this framework. An angular tolerance given at
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//! the time of construction of this framework, will be used to
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//! check the parallelism of the two tangent vectors. This
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//! checking procedure, and all the relative computations will be
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//! performed by the function Perform.
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//! When the sequence of adjacent Bezier curves is complete,
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//! use the following functions:
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//! - Perform to compute the data needed to build the BSpline curve,
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//! - and the available consultation functions to access the
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//! computed data. This data may be used to construct the BSpline curve.
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//! Warning
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//! The sequence of Bezier curves treated by this framework is
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//! automatically initialized with the first Bezier curve when the
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//! function is first called. During subsequent use of this function,
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//! ensure that the first point of the added Bezier curve (i.e. the
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//! first point of the Poles table) is coincident with the last point
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//! of the sequence (i.e. the last point of the preceding Bezier
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//! curve in the sequence) of Bezier curves still contained in
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//! this framework. An error may occur at the time of
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//! computation if this condition is not satisfied. Particular care
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//! must be taken with respect to the above, as this condition is
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//! not checked either when defining the sequence of Bezier
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//! curves or at the time of computation.
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Standard_EXPORT void AddCurve (const TColgp_Array1OfPnt2d& Poles);
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//! Computes all the data needed to build a BSpline curve
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//! equivalent to the sequence of adjacent Bezier curves still
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//! contained in this framework.
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//! A knot is inserted on the computed BSpline curve at the
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//! junction point of two consecutive Bezier curves. The
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//! degree of continuity of the BSpline curve will be increased
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//! at the junction point of two consecutive Bezier curves if
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//! their tangent vectors at this point are parallel. An angular
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//! tolerance given at the time of construction of this
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//! framework is used to check the parallelism of the two
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//! tangent vectors.
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//! Use the available consultation functions to access the
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//! computed data. This data may then be used to construct
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//! the BSpline curve.
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//! Warning
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//! Ensure that the curves in the sequence of Bezier curves
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//! contained in this framework are adjacent. An error may
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//! occur at the time of computation if this condition is not
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//! satisfied. Particular care must be taken with respect to the
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//! above as this condition is not checked, either when
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//! defining the Bezier curve sequence or at the time of computation.
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Standard_EXPORT void Perform();
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//! Returns the degree of the BSpline curve whose data is
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//! computed in this framework.
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//! Warning
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//! Take particular care not to use this function before the
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//! computation is performed (Perform function), as this
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//! condition is not checked and an error may therefore occur.
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Standard_EXPORT Standard_Integer Degree() const;
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//! Returns the number of poles of the BSpline curve whose
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//! data is computed in this framework.
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//! Warning
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//! Take particular care not to use this function before the
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//! computation is performed (Perform function), as this
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//! condition is not checked and an error may therefore occur.
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Standard_EXPORT Standard_Integer NbPoles() const;
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//! Loads the Poles table with the poles of the BSpline curve
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//! whose data is computed in this framework.
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//! Warning
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//! - Do not use this function before the computation is
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//! performed (Perform function).
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//! - The length of the Poles array must be equal to the
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//! number of poles of the BSpline curve whose data is
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//! computed in this framework.
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//! Particular care must be taken with respect to the above, as
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//! these conditions are not checked, and an error may occur.
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Standard_EXPORT void Poles (TColgp_Array1OfPnt2d& Poles) const;
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//! Returns the number of knots of the BSpline curve whose
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//! data is computed in this framework.
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//! Warning
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//! Take particular care not to use this function before the
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//! computation is performed (Perform function), as this
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//! condition is not checked and an error may therefore occur.
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Standard_EXPORT Standard_Integer NbKnots() const;
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//! Loads the Knots table with the knots
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//! and the Mults table with the corresponding multiplicities
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//! of the BSpline curve whose data is computed in this framework.
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//! Warning
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//! - Do not use this function before the computation is
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//! performed (Perform function).
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//! - The length of the Knots and Mults arrays must be equal
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//! to the number of knots in the BSpline curve whose data is
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//! computed in this framework.
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//! Particular care must be taken with respect to the above as
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//! these conditions are not checked, and an error may occur.
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Standard_EXPORT void KnotsAndMults (TColStd_Array1OfReal& Knots, TColStd_Array1OfInteger& Mults) const;
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protected:
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private:
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Convert_SequenceOfArray1OfPoles2d mySequence;
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TColgp_SequenceOfPnt2d CurvePoles;
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TColStd_SequenceOfReal CurveKnots;
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TColStd_SequenceOfInteger KnotsMultiplicities;
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Standard_Integer myDegree;
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Standard_Real myAngular;
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Standard_Boolean myDone;
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};
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#endif // _Convert_CompBezierCurves2dToBSplineCurve2d_HeaderFile
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